n, k = map(int, input().split())
A = [*map(int, input().split())]
B = [*map(int, input().split())]
C = [*map(int, input().split())]

ranking = list()
for i in range(n):
    ranking.append((A[i] + B[i], 0, i))
    ranking.append((A[i] + C[i], 1, i))

used = set()

ans = 0
ranking.sort(reverse=True)

made_salt = k
made_sauce = n - k
for i in range(len(ranking)):
    value = ranking[i][0]
    taste = ranking[i][1]
    index = ranking[i][2]
    if taste == 0 and made_salt > 0 and index not in used:
        ans += value
        made_salt -= 1
        used.add(index)
    if taste == 1 and made_sauce > 0 and index not in used:
        ans += value
        made_sauce -= 1
        used.add(index)
    if made_salt <= 0 and made_sauce <= 0:
        break

print(ans)